Question

factorise the following polynomials:

Q. 4a²+25b²-c²-20ab

correct answer will be marked as brainliest​

Answer 1

Answer:

Formula,

(a+b+c)

2

=a

2

+b

2

+c

2

+2ab+2bc+2ca

⇒(a+b+c)

2

=a

2

+b

2

+c

2

+2(ab+bc+ca)

Given,

ab+bc+ca=10,a

2

+b

2

+c

2

=16

⇒(a+b+c)

2

=16+2(10)

a+b+c=

16+20

=6

Answer 2

Mark me as brainliest

^2

Answer:

Mark me as brainliest

Step-by-step explanation:

(2a)

${2a}^2 \ + 2 \times 2a \times 5b + {5b}^{2} \\ (2a + 5b) {}^{2}$