Sign Up to access video explanations to official ACT tests.

Comments

Will Shermansays

Please be more specific. In this video you just say “minus six because I need to subtract it twice,” but you don’t tell us WHY you need to subtract six instead of 3.

I believe its because we are taking 3 from each side. In other words, the question stem tells us the brick is 3 foot wide so we have to subtract the 3 from both lengths (left and right) and we are also doing that with the widths(up and down). Hope this helps!!

Couldn’t conjugate zeroes theorem be faster for 60. You know that if 1+i is solution then 1-i must also be solution. Then (x-(1+i))x(x-(1-i))=0. You foil out and it equals K.

Yes, that would absolutely work. The complex roots occur as conjugate pairs and the approach you mentioned would give you the relevant quadratic equation.

Will Sherman says

Please be more specific. In this video you just say “minus six because I need to subtract it twice,” but you don’t tell us WHY you need to subtract six instead of 3.

ROMIL says

I believe its because we are taking 3 from each side. In other words, the question stem tells us the brick is 3 foot wide so we have to subtract the 3 from both lengths (left and right) and we are also doing that with the widths(up and down). Hope this helps!!

Prabh Dhaliwal says

Couldn’t conjugate zeroes theorem be faster for 60. You know that if 1+i is solution then 1-i must also be solution. Then (x-(1+i))x(x-(1-i))=0. You foil out and it equals K.

Dabral says

Hi Prabh,

Yes, that would absolutely work. The complex roots occur as conjugate pairs and the approach you mentioned would give you the relevant quadratic equation.

Dabral

harsh says

why is it for the 2018 test of April of ACT the answer to number 1 of reading section is D and not A due to the chronological order