Question

Solving with Quadratic formula help?

Answer 1

Look, I tried to solve this problem but I get

Answer 2

square root of 10, not the correct answer which is in red

Answer 3

I used the quadratic formula, I get a little confused when I get to

Answer 4

-4 plus or minus 4 square root of 10 all over 8

Answer 5

4X^2 + 4x - 9 = 0

x =[-4 +/- sqrt(16 - 4*4*-9)] / 2*4

Answer 6

= -4 +/- sqrt 160
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8

Answer 7

sqrt160 = sqrt10 * sqrt16 = 4sqrt10

Answer 8

ok

Answer 9

yw

Answer 10

so -4 plus or minus 4 square root of 10 all over 8 ?

Answer 11

yea

which reduces to [ -1 +/- sqrt10] / 2

Answer 12

Ohh thanks so much

Answer 13

But what happened to the 4 in front of square root of 10?