Question

( x + 5 ) ( x - 3 ) = ?
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Answer 1

Answer:

x^2+2x-15

Step-by-step explanation:

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Answer 2

Answer:

• Given - (x+ 5) ( x-3)

• To find - Solution of this question

• Solution -

Using identity - (x+ a )( x+ b) = x^2 + (a+b)x + ab

here - x= x

a= 5

b= (-3)

x^2 + (5 -3)x + 5(-3)

x^2 + 2x - 15

More to know

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Some more identity

common identity

i) ( a+ b)^2 = a^2 + b^2 + 2ab

ii) (a-b)^2 = a^2 + b^2 - 2ab

iii) (a+ b)(a-b) = a^2 - b^2

Some identity which are hard to remember

(a+b)^3 = a^3 + b^3 + 3ab ( a+b)

( a- b)^3 = a^3 - b^3 - 3ab ( a-b)

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