Question

R^+3r-54factorise it

Answer 1

Required Answer:-

Given to factorise:

• r² + 3r - 54

Solution:

This kind of questions are solved by splitting method.

Here is the solution.

r² + 3r - 54

= r² - 6r + 9r - 54

= r(r - 6) + 9(r - 6)

= (r + 9)(r - 6) [Note that: -6 × 9 = -54 and -6 + 9 = 3]

Hence, the factorised form of the polynomial is (r + 9)(r - 6)

Answer:

• The factorised form of the polynomial is (r + 9)(r - 6)

Answer 2

To factorise:-

• r²+3r-54

Solution:-

• First we will find which two numbers multiply to form -54 and their sum is 3
• Yes...9 and -6
• 9+(-6)=3
• 9×-6=-54

Here comes the solution....

r²+3r-54

r²+9r-3r-54

r(r+9)-3(r+9)

(r-3)(r+9)

Correct answer:-

• (r-3)(r+9)