Mathematics: I ve tried to get the answer for this actually 10 times now, plzzz help: write a formula that represents the number of people in the nth row (pre-calc problem, I only need the formula)

The two values of x are -2.5 and -3Step-by-step explanation:we haveThe formula to solve a quadratic equation of the form is equal to in this problem we have substitute in the formula thereforeThe two values of x are -2.5 and -3...

I ve tried to get the answer for this actually - id1012811576, Diegosolorzano50

Ответ:

lamontcarter

16.11.2020

Mathematics

The two values of x are -2.5 and -3

Step-by-step explanation:

we have

$2x^{2}+11x+15=0$

The formula to solve a quadratic equation of the form $ax^{2} +bx+c=0$ is equal to

$x=\frac{-b(+/-)\sqrt{b^{2}-4ac}} {2a}$

in this problem we have

$a=2\\b=11\\c=15$

substitute in the formula

$x=\frac{-11(+/-)\sqrt{11^{2}-4(2)(15)}} {2(2)}$

$x=\frac{-11(+/-)\sqrt{1}} {4}$

$x=\frac{-11(+/-)1} {4}$

$x_1=\frac{-11(+)1} {4}=-2.5$

$x_2=\frac{-11(-)1} {4}=-3$

therefore

The two values of x are -2.5 and -3

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I've tried to get the answer for this actually 10 times now, plzzz help: write a formula that represents the number of people in the nth row (pre-calc problem, I only need the formula)

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