Question

hi mates
please solve this fastly​

Answer 1

lets rationalize the denominator first:-

=25/(√40-√80)×(√40+√80)/(√40+√80)

=25×(√40+√80)/((√40)²-(√80)²)

√40 can be written as 2√10

√80 can be written as 4√5

=25×(2√10+4√5)/(40-80)

now putting the values of √5 and √10, we get:-

=25×(2×3.162+4×2.236)/(-40)

=381.7/(-40)

=-9.5425

Answer 2

Answer:

In a polynomial P(x)=2x³-7x²+kx+20. It P(2)=P(3).

a) find the value of k. then write polynomial

b) then find P(-2)