Question

3. Find the value of the following expressions, when x=-1:
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Answer 1

Step-by-step explanation:

hope it will be helpful to you.............

Answer 2

$\mathbb{QUESTION}$

$\textsf{to find the value of following using x=-1}$

$i)+2x-7\\ii)-x+2\\iii)+x^2+2x+1\\iv)+2x^2-x-2$

$\mathbb{SOLUTION}$

$\textsf{given- x=-1}$

$\textsf{to find the value of following using x=-1}$

$a) \:\:\:2x-7$

$\:\:\:\:2x-7\\=2(-1)-7\\\:\:\:\:-2-7\\\:\:\:\:=-9$

$\boxed{-9}$

$b)\:\:\:-x+2$

$-x+2\\\:\:\:=-(-1)+2\\\:\:\:=+1+2\\=+3$

$\boxed{+3}$

$c)x^2+2x+1$

$\;\:\:x^2+2x+1\\=(-1)^2+2(-1)+1\\\:\:=1+-1+1\\=0$

$\boxed{0}$

$d) \:\:2x^2-x-2$

$\: \:\:2x^2-x-2\\=2(-1)^2-(-1)-2\\=2+1-2\\=1$

$\boxed{+1}$

$\mathcal{HOPE\;IT\:HELPS}$

$\mathcal{BY\:BRAINLY\:ROSHAN}$