Question

How does this equal zero?! Please help! http://prntscr.com/aew1je

Answer 1

It's a conditional equation, true for two particular values of x. Your task is to find those two values / solutions / roots.

Answer 2

try dividing all three terms by 4. Does this simplify the problem for you?

Answer 3

this is an equation and there are some values of x which satisfy it.
4x^2 - 100 = 0
add 100 to both sides
4x^2 - 100 + 100 = 100
4x^2 = 100
divide both sides by 4

x^2 = 25

Answer 4

And the square root of 25 is 5, so five would be the final answer...?

Answer 5

no there is an other answer - there are 2 square roots of 25

Answer 6

It would indeed be an answer, but there's another answer. Find it.

Answer 7

Oh! 5, -5?

Answer 8

correct

Answer 9

Thank you both! <3 I'd medal you both if I could. :P