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3 years ago

3.-9 real number system

Mathematics

1 answer:

DIA [1.3K]3 years ago

5 0

Stepstep explanation:

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If x+a is a factor of 2x²+2ax+5x+10,find a.

vazorg [7]

If $x+a$ is a factor of the polynomial, it means that $-a$ is a root of the polynomial.

In fact, if a polynomial $p(x)$ has a root $x_0$ (i.e. $p(x_0)=0$ ), then the polynomial is divisible by $(x-x_0)$

In your case, you know that the polynomial is divisible by $(x+a)=(x-(-a))$ , so $-a$ is a solution.

Let's evaluate $p(-a)$ and set it to zero:

$2(-a)^2+2a(-a)+5(-a)+10 = 0 \iff 2a^2-2a^2-5a+10=0 \iff -5a+10 = 0 \iff a = 2$

We can check the answer: if $a=2$ the polynomial becomes

$2x^2+2(2)x+5x+10 = 2x^2+9x+10$

And we're claiming that $-a=-2$ is a root of this polynomial:

$2(-2)^2+9(-2)+10 = 2\cdot 4 - 18 + 10 = 0$

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3 years ago

What is 8+24÷(2×6_4 what is the strategy I used and what's the answer

MakcuM [25]

There is a problem with your question. it doesn't make sense ???

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3 years ago

Order the numbers from least to greatest: -6, 5, -5, 6, 0

Arturiano [62]

-6,-5,0,5,6 that is the order from least to greatest

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3 years ago

HI PLEASE HELP BELOW IM REALL IN NEED OF HELP

aalyn [17]

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3 years ago

MATH PLS HELP<br> (7h+9)+(4h+4)

Vsevolod [243]

Answer:

11h+13

Step-by-step explanation:

7h+4h=11h

9+4=13

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3 years ago

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