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Identify the parental genotypes.
From the description, "widow's peak" is dominant, and "frontal hairline" is recessive. We will use $B$ for widow's peak and $b$ for frontal hairline.
A man with homozygous widow's peak has the genotype $BB$ .
A woman with homozygous frontal hairline has the genotype $bb$ .
Determine the gametes produced by each parent.
The man ( $BB$ ) will produce all gametes with $B$ .
The woman ( $bb$ ) will produce all gametes with $b$ .
Use a Punnett square to determine the F1 offspring genotypes.
$\begin{array}{|c|c|} \hline \text{Gametes} & B \\ \hline b & Bb \\ \hline \end{array}$
The F1 offspring will all have the genotype $Bb$ .
Determine the phenotype of the F1 offspring.
Since $B$ is the dominant trait, all individuals with the $Bb$ genotype will express the widow's peak trait.

F1 offspring:
Genotype: $Bb$
Phenotype: Widow's peak

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