Math, asked by JJessica, 11 months ago

5. If a + b = 7 and ab = 10; find a - b.
6. If a - b = 7 and ab = 18; find a + b.​

Answers

Answered by BrainlyVirat
32

Answers :

Q.5) ==⟩ 3

Q.6) ==⟩⟩ ±11

Step by step explanation :

Q.5) a + b = 7

ab = 10

a - b = ?

We know that,

(a + b)² = (a - b)² + 4ab

(7)² = (a - b)² + 4 × 10

49 = (a - b)² + 40

9 = (a - b)²

√9 = (a - b)

3 = a - b

Value of a - b = 3

_________________________

Q.6) a - b = 7

ab = 18

a + b = ?

We know that,

(a + b)² = (a - b)² + 4ab

(a + b)² = (7)² + 4 × 18

(a + b)² = 49 + 72

(a + b)² = 121

(a + b) = √121

(a + b) = ±11

Value of a + b = ±11

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