6x^2 -9x -2 just add common variables
Answer:
(- 2, 4 )
Step-by-step explanation:
y = 2x + 8 → (1)
y = - 2x → (2)
substitute y = 2x + 8 into (2)
2x + 8 = - 2x ( add 2x to both sides )
4x + 8 = 0 ( subtract 8 from both sides )
4x = - 8 ( divide both sides by 4 )
x = - 2
substitute x = - 2 into (2)
y = - 2(- 2) = 4
solution is (- 2, 4 )
<span>437 = (21 + x)(21 - x), then x = 2, -2</span>
Answer:
4
Step-by-step explanation:
a+16=20
a=20-16
a=4
