Question

Solve : (z-4) (z+4) = (z+3) (z-7)+35​

Answer 1

Step-by-step explanation:

=> (z-4) (z+4) = (z+3) (z-7) + 35

=> z² - 16 = z²-7z + 3z -21+35

=> 4z = -21+35+16 =40

=> z = 40/4 = 10

|:| Z = 4

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Answer 2

Answer:

(z -4) ( z+4) = (z+3) (z-7) +35

z² -4z +4z -16 = z² -7z +3z -21 +35

z² -16 = z² -4z +35-21 { -4z +4z =0}

z² -z² +4z = 35 -21 +16

4z = 40

z = 40/4 =10