Question

5
If = a/b=b/c
prove that (a + b + c) (a - b + c) = 22 + b2 + c2​

Answer 1

Answer:

yes it is true

Step-by-step explanation:

given

$(a \div b) = ( b \div c)$

$ac = b {}^{2}$

(a+b+c)(a-b+c)=

$(a + c) {}^{2} - b {}^{2}$

$a {}^{2} + c {}^{2} + 2ac - b {}^{2}$

$a {}^{2} + c {}^{2} + 2(b {)}^{2} - b {}^{2}$

$a {}^{2} + b {}^{2} + c {}^{2}$