Pregunta
What is the value of the expression below when \( z=5 \) ? \[ 4 z^{2}-7 z-2 \]
Ask by Powell Williams. in the United States
Mar 12,2025
Solución de inteligencia artificial de Upstudy
Respuesta verificada por el tutor
Responder
When \( z=5 \), the expression \( 4z^{2}-7z-2 \) equals 63.
Solución
Substitute \( z=5 \) into the expression \( 4z^{2}-7z-2 \).
Evaluate the expression by following steps:
- step0: Evaluate:
\(4z^{2}-7z-2\)
- step1: Substitute:
\(4\times 5^{2}-7\times 5-2\)
- step2: Multiply the terms:
\(100-7\times 5-2\)
- step3: Multiply the numbers:
\(100-35-2\)
- step4: Subtract the numbers:
\(63\)
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Como
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Mind Expander
To find the value of the expression \( 4 z^{2}-7 z-2 \) when \( z=5 \), we start by substituting \( z \) with 5: \[ 4(5)^{2} - 7(5) - 2 \] Calculating \( (5)^{2} \) first, we get: \[ 4(25) - 35 - 2 \] Now, multiplying: \[ 100 - 35 - 2 \] Next, we subtract \( 35 \) from \( 100 \): \[ 65 - 2 \] Finally, subtracting \( 2 \) gives us: \[ 63 \] Thus, the value of the expression when \( z=5 \) is \( \boxed{63} \).

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