Question

if a and b are the polynomials of 2x2 - 4x +5 then find i) (a+b)2 ii) A3 + b3​

Answer 1

Step-by-step explanation:

$a \: \: and \: \: b \: are \: the \: root \: \\ of \: the \: equation \: \\ then \: a + b \: = 2 \\ \\ ab = \frac{5}{2} \\ {(a + b)}^{2} = 4 \\ \\ {a}^{3} + {b}^{3} = {(a + b)}^{3} - 3ab(a + b) \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 8 - 3 \times \frac{5}{2} \times 2 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: = - 7 \\ \\ hope \: it \: will \: help \: you$