Question

From the sum of 3+ 9x and 3x^2 - 7x - 4,
subtract the sum of 5x^2 - 8x and -8x + 9​

Answer 1

Answer:

Given

a

2

=13 and a

5

=25

We know that

a

n

=a+(n−1)d

∴a

2

=a+(2−1)d

⇒13=a+(2−1)d

⇒a+d=13 ...(i)

and a

5

=a+(5−1)d

⇒25=a+4d

⇒a+4d=25 ...(ii)

Now, subtracting (i) from (ii), we get

3d=12

⇒d=4

Now a+d=13 [from (i)]

⇒a=9

Hence, a

7

=a+6d=9+6(4)

⇒a

7

=33

Answer 2

Correct Question :- From the sum of 3x² - 5x + 2 , -5x²- 8x + 9 and subtract 4x² - 7x + 9. ?

Solution :-

→ {(3x² - 5x + 2) + (-5x²- 8x + 9)} - (4x² - 7x + 9)

→ (3x² - 5x² - 5x - 8x + 2 + 9) - (4x² - 7x + 9)

→ (-2x² - 13x + 11) - (4x² - 7x + 9)

→ - 2x² - 4x² - 13x + 7x + 11 - 9

→ (- 6x² - 6x + 2 ) (Ans.)

Learn more :-

k के किस मान के लिए दिये गए समीकरण निकाय 5x-7y-5=0 और 2x+Ky-1=0 का अद्वितीय हल होगा

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