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Katena32 [7]
3 years ago
7

Why can't the graphing calculator be used to solve (or approximate solutions to) all polynomial equations?

Mathematics
1 answer:
ipn [44]3 years ago
5 0
Because it is normally set to only find real roots, not complex roots

if you are smart, you can use the factor function and use your head to find those roots
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When solving for x, what is x squared plus 15 equals -8x
VLD [36.1K]

Answer:

x = - 5, x = - 3

Step-by-step explanation:

Given

x² + 15 = - 8x ( add 8x to both sides )

x² + 8x + 15 = 0 ← in standard form

Consider the factors of the constant term (+ 15) which sum to give the coefficient of the x- term (+ 8)

The factors are 5 and 3, since

5 × 3 = 15 and 5 + 3= 8, thus

(x + 5)(x + 3) = 0 ← in factored form

Equate each factor to zero and solve for x

x + 5 = 0 ⇒ x = - 5

x + 3 = 0 ⇒ x = - 3

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3 years ago
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68 miles to 42.5 miles
Thepotemich [5.8K]
1) subtract 42.5 miles from 68 miles to find the gross change in distance:  It is 25.5.  Since this is a decrease, write -25.5 miles.
2) divide -25.5 miles by the original distance, 68 miles:
     -0.375
3) multiply this by 100% to find the percentage decrease:
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5 0
3 years ago
The number of student of schoolwas 450 last year and it is 396 this year.By how many percent did the number decrease
zhannawk [14.2K]

Step-by-step explanation:

450 - 396 = 54

(54/450) * 100% = 12%

Hence the decrease is 12%.

3 0
3 years ago
Read 2 more answers
(x - 3)(2x^2 - 5x + 1)
Sunny_sXe [5.5K]

Answer:

2x^3-11x^2+16x-3

Step-by-step explanation:

Multiply x to all the other factors in the second parenthesis

Multiply -3 to all the other factors in the second parenthesis

3 0
3 years ago
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