[" Use the identity "(x+a)(x+b)=x^(2)+(a+b)x+ab],[[" (i) "(x+3)(x+7)," (ii) "]],[" (1) "x," (iv) "]

Important Identitiy (x+a)(x+b)=x^(2)+(a+b)x+ab

Using (x+a)(x+b) = x^2 + (a+b)x + ab, find 103 x 98

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)