Question

simplify the following expression and then find the numerical value for x= -2

a) 3(2x-4) + x power 2+ 5

b) -2(-3x + 5)-2( x+4) ​

Answer 1

${\huge{\sf{\green{Question}}}}$

• simplify the following expression and then find the numerical value for x= -2a) 3(2x-4) + x power 2+ 5b) -2(-3x + 5)-2( x+4)

${\huge{\sf{\green{Solution}}}}$

$\huge\rm\green{No.1}$

• $\implies$${\small{\sf{\green{3(2x-4) + x power 2+ 5}}}}$

Replace x with (-2)

• $\implies$${\small{\sf{\green{3(2×(-2)-4)+(-2)2+5}}}}$

Add (-2)-4

• $\implies$${\small{\sf{\green{ 3(2×6)-4+(-2)2+5}}}}$

Now add the powers 2+5

• $\implies$ ${\small{\sf{\green{3(2×6)-4+(-2)7}}}}$

Now multiply the times of powers with the base.

• $\implies$${\small{\sf{\green{3(2×6)-4+(-128)}}}}$

Now solve the brackets (2×6)

• $\implies$${\small{\sf{\green{3(12)-4-128}}}}$

Now add -4-128

• $\implies$ ${\small{\sf{\green{3(12)-132}}}}$

Now multiply 3×12

• $\implies$ ${\small{\sf{\green{36-132}}}}$

• $\implies$${\huge{\sf{\red{(-96)}}}}$

$\huge\rm\pink{No.2}$

• $\implies$${\small{\sf{\pink{-2(-3x + 5)-2( x+4)}}}}$

• $\implies$${\small{\sf{\pink{(-2(-3×(-2)+5)-2(-2+4)}}}}$
• (-14) Answer.