Question

if a-b=0.9and ab=0.36find a+b and a+b cube

Answer 1

(a + b)3 =. a3 - b3 -3ab(a - b)

= a3 - b3 - 3× 0.36×0.9

= a3 -b3. - 0.972.......................1

a3 - b3. = (a - b)(a2 + ab + b2)

a3 - b3. = (0.9) (0.36 + a2 + b2)................2

a2 + b2 = (a - b)^2 +2ab

a2 + b2 = ( 0.9)^2 +2(0.36)

a2 + b2 = 1.53.........................3

put equation 3 in equation 2

a3 - b3 = (0.9)(0.36 + 1.53)

=(0.324 + 1.377)

=1.701 .......................4

equation 4 put in equation 1

(a + b)^3 = 1.701-0.972

(a + b)^3 = 0.729

Answer 2

Answer:

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