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निम्नलिखित गुणनफलो को ज्ञात करने के लिए,...

निम्नलिखित गुणनफलो को ज्ञात करने के लिए, सर्वसमिका `(x+a)(x+b)=x^2+ (a+b)x+ab` का उपयोग कीजिए :
(i) `(x+3)(x+7)`
(ii) `(4x+5)(4x+1)`
(iii) `(4x-5)(4x-1)`
(iv) `(4x+5) (4x-1)`
(v) `(2x+5y)(2x+3y)`
(vi) `(2a^2+9)(2a^2+5)`
(vii) ` (xyz-4)(xyz-2)`.

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Use the identity (x+a)(x+b)=x^2+(a+b)x+ab to find the following products. (i) (x+3)(x+7) (ii) (4x+5)(4x+1) (iii) (4x+5)(4x+1) (iv) (4x+5)(4x-1) (v) (2x+5y)(2x+3y) (vi) (2a^2+9)(2a^2+5) (vii) (xyz-4)(xyz-2)

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