Question

MEDAL!

Use the quadratic formula to solve x^2 + 7x + 8 = 0. Estimate irrational solutions to the nearest tenth.

A {–12, 5}
B {–11.1, –2.9}
C {–5.6, –1.4}
D {–3.9, 12.1}

Answer 1

@wolf1728

Answer 2

a=1 b=7 c=8

x = [-b +-sqroot(b^2 - 4*a*c)] / 2*a

x = [-7 +-sqroot(49 -32)] / 2

x = [-7 + sqroot (17)] / 2

x = [-7 - sqroot (17)] / 2

sqroot (17) = 4.1231

x = [-7 + 4.1231] / 2

x = -2.8769/2

x = -1.439

x = [-7 - 4.1231] / 2

x = [-11.1231] / 2

x = -5.56155

Looks like it is C

Answer 3

Thx