Question

Solve using the quadratic formula... 9x2 - 4 + 7x

Answer 1

Answer:

x=0.4, x=-1.2

Step-by-step explanation:

Answer 2

Answer:

$x=-\frac{7}{18}+\frac{\sqrt[]{193} }{18}$ which is the same as $x=0.38$

or

$x=-\frac{7}{18}-\frac{\sqrt[]{193} }{18}$ which is the same as $x=-1.16$

Step-by-step explanation:

$9x^2-4+7x=0$

Rearranging...

$9x^2+7x-4=0$

a=9

b=7

c=-4

$x=\frac{-b\frac{+}{}\sqrt[]{b^2-4ac} }{2a}$

$x=\frac{-7\frac{+}{}\sqrt[]{(7)^2-4(9)(-4)} }{2(9)}$

$x=\frac{-7\frac{+}{}\sqrt[]{49+144} }{18}$

$x=\frac{-7\frac{+}{}\sqrt[]{193} }{18}$

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$x=-\frac{7}{18}+\frac{\sqrt[]{193} }{18}$

or

$x=-\frac{7}{18}-\frac{\sqrt[]{193} }{18}$

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If you need decimals, you can solve;

$x=0.38$

or

$x=-1.16$