5x2 + 2x - 3 = 0
5x2 + 5x - 3x - 3 = 0
5x(x + 1) - 3(x + 1) = 0
(5x - 3)(x + 1) = 0
So 5x - 3 = 0 or x + 1 = 0
ie x = 3/5 or x = -1
Chat with our AI personalities
10x3 + 3x2
Answer this question…A. x4 + 2x3 + 9x2 + 4 B. x4 + 4x3 + 9x2 + 4 C. x4 + 2x3 + 9x2 + 4x + 4 D. x4 + 2x3 + 9x2 - 4x + 4
Assuming that the 2 in "5x2" is a power (5x2), then no, this is not a linear equation. It is a parabolic equation.
5x2 + 8x = 7 5x2 + 8x - 7 = 0 This cannot be factorised so the solutions need to be determined using the quadratic formula The solutions are {-8 ± sqrt[82 - 4*5*(-7)]}/(2*5) = {-8 ± sqrt[64 + 140]}/10 = {-8 ± sqrt[204]}/10 = -2.22829 and 0.62829 (to 5 dp)
The discriminant is 385.