Question

Factorisation of algebraic expressions :
• if x + y = 10 and x - y = 4 , find the value of x2 - y2 .​

Answer 1

Answer:

x2-y2=x+y×x-y

4×10=40.

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Answer 2

Answer:

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Step-by-step explanation:

$we \: \: know \: \: that \\ {x}^{2} - {y}^{2} = (x + y)(x - y) \\ \\ putting \: \: values, \: \: we \: \: get \\ {x}^{2} - {y}^{2} = (10)(4) \\ {x}^{2} - {y}^{2} = 40$