Question

simplify the expressions and find their values of p=1,q=1,r=2
a. 5p^2-6q^2-7r^2+6p^2-5q^2+2r^2​

Answer 1

Answer:

$5p {}^{2}- 6q { }^{2}- 7r {}^{2} + 6p {}^{2}- 5q {}^{2} + 2r {} ^{2} = 5 \times 1 {}^{2} - 6 \times 1 {}^{2} - 7 \times 2 {}^{2} + 6 \times 1 {}^{2}- 5 \times 1 {}^{2} + 2 \times 2 {}^{2} = - 20.(p = 1.q = 1r = 2)$

Answer 2

$\huge\purple{\boxed{\tt{}{Answer:}}}$

$\large\color{pink}{-20}$

$\large\purple{\boxed{\tt{}{Solution:}}}$

5p^2-6q^2-7r^2+6p^2-5q^2+2r^2

= 5(1)^2-6(1)^2-7(2)^2+6(1)^2-5(1)^2+2(2)^2

= 5- 6-28+6-5+8

$\large\color{lime}{= -20}$

$\huge\purple{\boxed{\tt{}{Explanation:}}}$

substitute the value of p,q and r