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4 years ago

3x 2 + 2x - 5 and -4 + 7x 2

Mathematics

2 answers:

fiasKO [112]4 years ago

4 0

Answer:

16+2x-5adn

Step-by-step explanation:

6+2x-5adn-4+14. solution: is 16=2x-5adn

vladimir1956 [14]4 years ago

4 0

Answer:

$\boxed{ \bold{ \huge{ \boxed{ \sf{10 {x}^{2} + 2x - 9}}}}}$

Step-by-step explanation:

$\sf{3 {x}^{2} + 2x - 5 + ( - 4 + 7 {x}^{2} )}$

When there is a ( + ) in front of an expression in parentheses, there is no need to change the sign of each term.

That means , the expression remains the same.

⇒ $\sf{3 {x}^{2} + 2x - 5 - 4 + 7 {x}^{2} }$

Collect like terms

⇒ $\sf{ {10x}^{2} + 2x - 5 - 4}$

Calculate

⇒ $\sf{10 {x}^{2} + 2x - 9}$

Hope I helped!

Best regards!!

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2 years ago

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$\bf \textit{Half-Angle Identities}
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sin\left(\cfrac{\theta}{2}\right)=\pm \sqrt{\cfrac{1-cos(\theta)}{2}}
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\\\\\\
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\\\\\\
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\\\\\\
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2\sqrt{2+\sqrt{3}}\cdot \sqrt{2-\sqrt{3}}\cdot \sqrt{2-\sqrt{3}}
\\\\\\
2\sqrt{(2+\sqrt{3})(2-\sqrt{3})\cdot (2-\sqrt{3})}
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