Question

If a + b = 12 & ab = 11, then the value of a2 –b2 will be
(a) 100 (b) 144 (c) 120 (d) 121

Answer 1

Answer:

${(a - b)}^{2} = {(a + b)}^{2} - 4ab \\ \\ = {(12)}^{2} - 4 \times 11 \\ \\ = 144 - 44 = 100 \\ \\ a - b = 10 \\ \\ {a}^{2} - {b}^{2} = (a + b)(a - b) = 10 \times 12 = 120$

Answer 2

Step-by-step explanation:

(a+b)^2=a^2+b^2+22

Sorry bro this is all I could do .I would also like to know the answer