Question

solve the following quadratic equation by factorisation 7m^2-84=0​

Answer 1

7m² - 84 = 0

Divide by 7

m² - 12 = 0

(m-√12)*(m+√12) = 0

m = √12 or m = -√12

ie, m = 2√3 or m = -2√3

Answer 2

Answer:

7m^2-84=0

i.e. 7(m^2-12)=0

i.e. m^2-12=0 [ since,7 is not equal to 0]

i.e. m^2-(2√3)^2=0

i.e. (m+2√3)(m-2√3)=0

i.e. m=-2√3,2√3

Step-by-step explanation:

hope it helps you....