Question

give explanation pls​

Answer 1

SOLUTION :

• 1)

$\longrightarrow\sf 2x^2+x-a=5$

• Substitute the value of x :

$\longrightarrow\sf 2 (0)^2+0-a=5$

$\longrightarrow\sf 2\times 0+0 - a = 5$

$\longrightarrow\sf 0+0 - a = 5$

$\longrightarrow\sf 0+0 -5 = a$

$\longrightarrow\sf -5 = a$

$\longrightarrow{\underline{\boxed{\pink{\bf a=-5 }}}}$

• 2)

$\longrightarrow\sf p-(p-q)-q-(q-p)$

$\longrightarrow\sf p-p+q-q-q+p$

$\longrightarrow\sf p+p-p+q-q-q$

$\longrightarrow\sf 2p-p+q-2q$

$\longrightarrow\underline {\boxed{\pink{\bf{ p-q}}}}$