Question

02 и Type 17. Find the values of the following: (1) a²+ b² when a - b = 4 and ab = 3​

Answer 1

a-b=4

squaring both sides

(a-b) ²=4²

a²+b²-2ab=16

a²+b²-2×3=16

a²+b²-6=16

a²+b²=16+6

a²+b²=22

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