Question

if a+b =9 and ab =20 then find the value of a square + b square?

Answer 1

Answer:

Step-by-step explanation:

(a+b)^2=a^2+b^2+2ab

(9)^2=a^2+b^2+2×20

81=a^2+b^2+40

81-40=a^2+b^2

41 = a^2+b^2

Hope thse would helps u ✌✌❤

Answer 2

$(a + b) {}^{2} = a {}^{2} + b {}^{2} + 2ab$

Now put values of a+b and ab

$(9) {}^{2} = a {}^{2} + b {}^{2} + 2(20)$

$81 - 40 = a {}^{2} + b {}^{2}$

$a {}^{2} + b {}^{2} = 41$

Thanks