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Chapter 10: Q 269 (page 1236)

Solve the quadratic equation by quadratic formula r2-r-42=0

Short Answer

Expert verified

The required result isr=7,-6

Step by step solution

01

 Given Information 

The given equation is r2-r-42=0

02

Write the quadratic equation in standard form and identify a,b,c .

The quadratic equation is in standard form.

So,

a=1,b=-1,c=-42

03

Substitute the values in quadratic formula.

x=-b卤b2-4ac2a

role="math" localid="1650281866946" r=--1卤-12-41-4221r=1卤1+1692

r=1卤1692r=1卤132

We can write it as

r=1+132,1-132r=142,-122r=7,-6

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Most popular questions from this chapter

Solve the quadratic equation using square root property.

7p2+10=26.

Solvex2-6x+9=12.

Complete the square to make a perfect square trinomial. Then, write the result as a binomial squared.

n2-16n

Complete the square to make a perfect square trinomial. Then, write the result as a binomial squared.

b2+12b

Solve(b+2)2=40
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