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jenyasd209 [6]
2 years ago
15

Solve Quadratic Equations (show all work)

Mathematics
1 answer:
Anni [7]2 years ago
3 0

(9) The solution is x = 1 and x = 5

(10) The solution is x = 12 and x = -8

Explanation:

(9) The given expression is (x+3)(x-3)=6 x-14

We need to determine the solution of the equation.

The term (x+3)(x-3) can be expanded using the formula, (a+b)(a-b)=a^{2}-b^{2}

Thus, we have,

x^{2}-9=6 x-14

x^{2}+5=6 x

x^{2}-6 x+5=0

Solving the quadratic equation, we get,

(x-5)(x-1)=0

The solution of the quadratic equation are x = 5 and x = 1

(10) The given expression is 3 x^{2}-12 x-288=0

We need to determine the solution of the equation.

Let us solve the equation using the quadratic formula,

x=\frac{-b \pm \sqrt{b^{2}-4 a c}}{2 a}

where a=3, b=-12, c=-288

Thus, we have,

x=\frac{-(-12) \pm \sqrt{(-12)^{2}-4 \cdot 3(-288)}}{2 \cdot 3}

Simplifying the terms, we have,

x=\frac{12 \pm \sqrt{144+3456}}{6}

x=\frac{12 \pm \sqrt{3600}}{6}

x=\frac{12 \pm60}{6}

Thus, the roots are

x=\frac{12 +60}{6}  and  x=\frac{12 -60}{6}

x=\frac{72}{6}  and  x=\frac{-48}{6}

x=12  and  x=-8

Thus, the solution is x = 12 and x = -8

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