3 years ago

7 + 6d + 5f use d = 3 and f = 9

Mathematics

2 answers:

Harrizon [31]3 years ago

6 0

The answer to that question

Travka [436]3 years ago

6 0

Answer:

Step-by-step explanation:

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3 years ago

Solve the equation by factoring.

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Factorizing an expression involves writing the expression in simpler forms

The values of z are $z = \frac 15$ or $z=4$

The equation is given as:

$5z^2 - 21z + 4 = 0$

Expand the equation

$5z^2 - 20z -z + 4 = 0$

Factorize the expression:

$5z(z - 4) -1(z - 4) = 0$

Factor out z - 4

$(5z - 1)(z - 4) = 0$

Split

$5z -1 = 0$ or $z - 4 = 0$

Solve for z

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Hence, the values of z are $z = \frac 15$ or $z=4$