Question

(x + y)² = 100 तथा (x -y)² = 64 तो x का मान ज्ञात करो
(a) 14
(b) 12
(c) 10
(d)9​

Answer 1

Answer:

Additionalknowledge

Knowledge about Quadratic equations -

★ Sum of zeros of any quadratic equation is given by ➝ α+β = -b/a

★ Product of zeros of any quadratic equation is given by ➝ αβ = c/a

★ A quadratic equation have 2 roots

★ ax² + bx + c = 0 is the general form of quadratic equation

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Answer 2

(x+y)²=100

x+y=10 eq 1

(x-y)²=64

x-y=8. eq2

adding eq 1and 2

2x=18

x=9

9-y=8

y=9-8=1