Is Your Math Brain Ready for This Challenge?

Ajouté : 2026-05-23

[00:00:00]Hey guys, welcome to this video. In this video we want to find the value of this expression. 1 - 9 * 1 - 9. Are you ready to solve? Let's go down to start it.

[00:00:13]1 - 9 gives us -8.

[00:00:19]And again here we have 1 - 9.

[00:00:27]So, -8 * -8 which equals positive 64.

[00:00:37]But this answer is not correct because according to the order of operations, which is PEMDAS, P stands for parentheses, E stands for exponents, M and D stand for multiplication and division, and A and S stand for addition and subtraction.

[00:00:59]First, we have to do parentheses, then exponents, then multiplication or division, and then finally addition or subtraction.

[00:01:08]Remember that multiplication and division have equal priority and we have to work from left to right.

[00:01:16]And the same applies to addition and subtraction.

[00:01:19]In this expression, we have one subtraction, one multiplication, and a one parentheses. Inside this parentheses, we have one subtraction.

[00:01:29]Here we have a multiplication because in mathematics when a number is placed next to parentheses, it means multiplication, and we usually don't write the multiplication sign for brevity. Okay?

[00:01:41]So, according to the PEMDAS, first we have to do this parentheses, then this multiplication, and then finally this subtraction. If we do this subtraction before this multiplication or this parentheses, it is wrong.

[00:01:57]>> [snorts] >> So, first we have to do this parenthesis.

[00:02:09]Inside this parenthesis, we have 1 - 9, which equals -8.

[00:02:17]So, we have 1 -9 * -8.

[00:02:24]Now, we have one subtraction and one multiplication. According to the PEMDAS, multiplication has higher priority than subtraction.

[00:02:33]Because multiplication comes before subtraction. So, here first we have to do this multiplication. 9 * -8 gives us -72.

[00:02:49]So, we have 1 - -72.

[00:02:55]Now, negative times negative gives us positive.

[00:03:00]So, we have 1 + 72.

[00:03:06]And this is equal to 73.

[00:03:11]So, we have 73, and this is our final answer to this problem.

[00:03:17]The correct answer is 73.