Question

4)Determine a raiz de cada função.
a)y = 3x -9
b)f(x) = 2x + 12
c)f(x)= x +7
d)y = 5x - 7

Me ajudem pfvrrrrrrr

Answer 1

Substitua o Y ou F (x) por 0, e Resolva a equação:

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$\large \sf Letra \: \:A)$

$\large \sf y = 3x - 9\\\\\large \sf 0=3x-9\\\\\large \sf 9=3x\\\\\large \sf x=\dfrac{9}{3}\\\\\boxed{\red{\large \sf x=3 }}$

=========================>

$\large \sf Letra \: \: B)$

$\large \sf f(x)=2x+12\\\\\large \sf 0=2x+12\\\\\large \sf -12=2x\\\\\large \sf x=\dfrac{12}{2}\\\\\boxed{\red{\large \sf x=-6 }}$

=========================>

$\large \sf Letra \: \: C)$

$\large \sf f(x)=x+7\\\\\large \sf 0=x+7\\\\\boxed{\red{\large \sf x=-7}}$

=========================>

$\large \sf Letra \: \: D)$

$\large \sf y=5x-7\\\\\large \sf 0=5x-7\\\\\large \sf 7=5x\\\\\boxed{\red{\large \sf x=\dfrac{7}{5} }}$

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