Question

find the root of the following quadratic equations by factorisation (x+3)(x-3)=40​

Answer 1

Answer:

7 or -7

Step-by-step explanation:

solve the linear equation

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Answer 2

Answer:

x = 7;x = -7

Step-by-step explanation:

(x+3)(x-3)=40

x²-9=40 [:•USING IDENTITY (A+B)(A-B)=A²-B²]

x²-49=0

(x+7)(x-7)=0 [:•FACTORIZING USING ABOVE IDENTITY]

x+7=0 ; x-7=0

x = 7 ; x = -7