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3 years ago

Which equation shows the quadratic formula used correctly to solve 7x2 = 9+ x for x?

Mathematics

2 answers:

SCORPION-xisa [38]3 years ago

7 0

This can also be explained as D on edg :)

____ [38]3 years ago

6 0

Answer:

x = (1 + sqrt(253))/14 or x = (1 - sqrt(253))/14

Step-by-step explanation:

Solve for x:

7 x^2 = x + 9

Subtract x + 9 from both sides:

7 x^2 - x - 9 = 0

x = (1 ± sqrt((-1)^2 - 4×7 (-9)))/(2×7) = (1 ± sqrt(1 + 252))/14 = (1 ± sqrt(253))/14:

Answer: x = (1 + sqrt(253))/14 or x = (1 - sqrt(253))/14

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6 0

3 years ago

Perform the modular arithmetic. (7 · 15) (mod 4)

Reika [66]

We could do it by first writing

$7\cdot15=(4+3)\cdot(4+11)=4^2+14\cdot4+33$

so that

$7\cdot15\equiv4^2+14\cdot4+33\equiv33\pmod4$

and since $33=32+1=8\cdot4+1$ , we have

$7\cdot15\equiv33\equiv1\pmod4$

# # #

Alternatively, we can just compute the product and take it mod 4:

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3 years ago

9. If the area of a square is given by the polynomial 4x2 – 36x + 81, then which of the following expressions represents the len

Otrada [13]

Answer:

it is b

Step-by-step explanation:

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