Variable expressions Quiz 1

Question 1

Solve: $$4x	ext{ }-	ext{ 12 }=0$$

Accepted Answer

$$3$$

Answer

$$-3$$

Answer

$$-4$$

Answer

$$4$$

Question 2

Subtract : $$\left( 	ext{-3x + 7} ight)$$ from $$\left( 4x	ext{ + 5 } ight)$$.

Accepted Answer

$$7x-2	ext{ }$$

Answer

$$-7x-2	ext{ }$$

Answer

$$7x+2$$

Answer

$$-7x+2	ext{ }$$

Question 3

Solve - $$\left( x+5 \right)\left( x+6 \right)\left( x+3 \right)$$

Accepted Answer

$${{x}^{3}}+14{{x}^{2}}+63x+90$$

Answer

$${{x}^{3}}+14{{x}^{2}}-63x-90$$

Answer

$${{x}^{3}}-14{{x}^{2}}+63x-90$$

Answer

None of these

Question 4

Solve: $$\dfrac{2}{4}{{x}^{2}}yz	imes \dfrac{4}{6}x{{y}^{2}}z	imes \dfrac{1}{5}{{x}^{2}}yz$$

Accepted Answer

$$\dfrac{1}{15}{{x}^{5}}{{y}^{4}}{{z}^{3}}$$

Answer

$$-\dfrac{1}{15}{{x}^{5}}{{y}^{4}}{{z}^{3}}$$

Answer

$$-\dfrac{5}{15}{{x}^{5}}{{y}^{4}}{{z}^{3}}$$

Answer

$$\dfrac{5}{15}{{x}^{5}}{{y}^{4}}{{z}^{3}}$$

Question 5

Find the area of the rectangle whose length and breadth are $$4{{x}^{2}}y$$m and $$5x{{y}^{2}}$$m respectively.

Accepted Answer

$$20{{x}^{3}}{{y}^{3}}	ext{ sq}	ext{. m}$$

Answer

$$20{{x}^{5}}{{y}^{3}}	ext{ sq}	ext{. m}$$

Answer

$$20{{x}^{3}}{{y}^{5}}	ext{ sq}	ext{. m}$$

Answer

$$20{{x}^{5}}{{y}^{5}}	ext{ sq}	ext{. m}$$