Answer:
(x + 7) (x - 3)
Step-by-step explanation:
Find 2 numbers that add to 4 and multiply to -21
(x+7)(x-4) x=-7,4
The factors of -21 that add up to 4 are 7 and -3, so put those as your two second values in your binomials and solve for x, in this case being the negative versions of the second term in the binomial
5-3x=-128
LHS = RHS
(5 - 3) x A = -128
( 2 ) x A = -128
2A / 2 = -128 / 2
A = -64
c 2.5
20²+21² = x²
841= x²
x= 29
nearest tenth = 30
-1 I think
5-3=2 and -1+3=2
-2
6i-5=-17
6i=-17+5
6i=-12
i=-12/6
i=-2
