Simplify the expression.

Mathematics

1 answer:

user100 [1]3 years ago

6 0

Ur answer is. 5 y^2+4y+14 because I went through it in class

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Remove the brackets and simplify

Komok [63]

Answer:

$5x - 7 {x}^{2} - {(2x)}^{2} \\ = ( {2}^{2} {x}^{2} ) - 7 {x}^{2} + 5x \\ = 4 {x}^{2} - 7 {x}^{2} + 5x \\ = x(4x - 7x + 5) \\ = x( 5 - 3x) \\ = { \underline{ \underline{ \: \: 5x - 3 {x}^{2} \: \: }}}$

7 0

3 years ago

Read 2 more answers

Can anyone explain those marked steps in case (iii)

Tema [17]

$\cos\dfrac{3x}2=\cos\left(\dfrac\pi2+\dfrac x2\right)$
$\implies \dfrac{3x}2=2n\pi+\dfrac\pi2+\dfrac x2$

follows from the fact that the cosine function is $2\pi$ -periodic, which means $\cos x=\cos(2\pi+x)$ . Roughly speaking, this is the same as saying that a point on a circle is the same as the point you get by completing a full revolution around the circle (i.e. add $2\pi$ to the original point's angle with respect to the horizontal axis).

If you make another complete revolution (so we're effectively adding $4\pi$ ) we get the same result: $\cos x=\cos(4\pi+x)$ . This is true for any number of complete revolutions, so that this pattern holds for any even multiple of $\pi$ added to the argument. Therefore $\cos x=\cos(2n\pi+x)$ for any integer $n$ .

Next, because $\cos(-x)=\cos x$ , it follows that $\cos x=\cos(2n\pi-x)$ is also true for any integer $n$ . So we have

$\implies \dfrac{3x}2=2n\pi\pm\left(\dfrac\pi2+\dfrac x2\right)$

The rest follows from considering either case and solving for $x$ .