Answer:
2x² − x − 21 = 0
Step-by-step explanation:
Simplify and arrange the terms in descending order by this
ax² + bx + c = 0
ax²= 2x + x
bx= x
c
or you could expand to solve
ax² + bx + c = 0
EXPAND
(2x + 7)( x −1)
Apply distributive property
2x (x−1) + 7 (x−1) = 0
2x ⋅ x + 2x ⋅−1 + 7 (x−1) = 0
2x ⋅ x + 2x ⋅ −1 + 7 x + 7 ⋅ − 1 = 0
Simplify and combine like terms
2x² −2x + 7x − 7 =0
Add −2x and 7x.
2x² + 5x − 7= 0
