Question

i m giving u 200 points .. please solve all questions from 7 to 8.. please its urgent

Answer 1

(7)

(a) y²-18y+81

Factorise

y²-9y-9y+81 = 0

y (y-9) -9 (y-9) = 0

(y-9)² = 0

y = 9

(b) x^4 + 22x² + 121 = 0

x^4 + 11x² + 11x² + 121 = 0

x² (x² + 11) + 11 (x² + 11)

(x²+11) (x²+11) = 0

(x²+11)² = 0

Applying square root on both sides

√(x²+11)² = √0

(x²+11) = 0

x² = -11

(c) p^6 - 4p³ +4

p^6 - 2p³ - 2p³ + 4

p³ (p³ - 2) -2 (p³ - 2) = 0

(p³ - 2) (p³ - 2) = 0

(p³ - 2)² = 0

Applying root both sides

(p³ - 2) = 0

p³ = 2

(d) a² + 2ab + b² - 16

= (a+b)² - (4)² ---------------------[identity is a²-b² = (a+b) (a-b)]

= (a+b+4) (a+b-4)

Answer 2

Answer:

it is 5 points question

----------_-------------_---------------