Question

find the product by using a suitable identity
a) (z+3)(z-7)

by using identity (x+a) (x+b) =x square +(a+bi) x +ab

Algebraic Identity​

Answer 1

Answer:

z²-4z-21

Step-by-step explanation:

(z+3)(z-7) = z²+(3+(-7)z+3(-7)

z²-4z-21

Answer 2

Answer:

${z + 3}{z - 7} = z 2 + {3 + ( - 7)z + 3( - 7) = z2 - 4z - 21$

Step-by-step explanation:

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